Patent Grant
11177713
This application is a National Stage of International Application No. PCT/JP2017/014345 filed Apr. 6, 2017.
The present invention relates to a rotating electric machine, for example, an electric motor or a power generator, and more particularly, to a structure of a stator winding.
In recent years, for a rotating electric machine such as an electric motor or a power generator, a small size with a high output and high quality are demanded. Further, in order to achieve a higher output, there has been used a stator of a distributed winding type. In the stator of a distributed winding type, thick conductor wires are used to cause a large current to flow through a stator winding, and the conductor wires are arranged in slots.
However, when the winding of the distributed winding type formed of the thick conductor wires is used, there arise problems in that, as compared to a case in which a winding of a concentrated winding type is used, an axial length of the stator becomes longer, and the number of components increases.
In view of the circumstances described above, in a related-art rotating electric machine described in Patent Literature 1, a terminal wire extending from a radially innermost position is connected to a terminal wire being a target to be connected, which extends from a radially outermost position, across a coil end. A connected portion thereof is bent so as to be brought closer to the coil end to project radially outward. In this manner, the axial length of the stator is shortened, and the number of components is reduced.
[PTL 1] JP 2013-150548 A
In Patent Literature 1, it is difficult to define a sufficient distance between terminal wires adjacent to each other, and hence there arises a problem in that quality in terms of an insulating property is lowered.
The present invention has been made to solve the problems described above, and has an object to provide a rotating electric machine, which has a small size with a small number of components and high quality in terms of an insulating property.
According to one embodiment of the present invention, there is provided a rotating electric machine, including a stator including: a stator core having an annular shape, which includes slots arranged in a circumferential direction of the stator core; and a stator winding mounted to the stator core. The stator winding includes a plurality of winding bodies formed by distributed winding, each being formed by winding a conductor wire a plurality of turns, which are inserted into a plurality of the slots to be mounted to the stator core. Each of the winding bodies includes a radially inner-side terminal extending from a radially innermost position in a corresponding one of the slots to one axial side of the stator core and a radially outer-side terminal extending from a radially outermost position in a corresponding one of the slots to the one axial side of the stator core. Each of the radially inner-side terminals for forming each of phase windings of the stator winding among the radially inner-side terminals extends from a radially innermost position in a corresponding one of the slots on a one-by-one basis while a circumferential bending direction after the extension of the radially inner-side terminal from the corresponding slot is changed alternately for each group of n radially inner-side terminals (in which n is a natural number equal to or larger than 2). Each of the radially outer-side terminals for forming each of the phase windings of the stator winding among the radially outer-side terminals extends from a radially outermost position in a corresponding one of the slots on a one-by-one basis while a circumferential bending direction after the extension of the radially outer-side terminal from the corresponding slot is changed alternately for a group of n radially outer-side terminals. Each of the phase windings is formed by directly joining distal end portions of the radially inner-side terminals respectively extending from the slots being separate from each other by n slots to be bent so as to be brought closer to each other and directly joining distal end portions of the radially outer-side terminals respectively extending from the slots being separate from each other by n slots to be bent so as to be brought closer to each other. A first angle formed between at least one of an oblique-side portion of each of the n radially inner-side terminals, which are continuous in the circumferential direction and are bent in the same circumferential bending direction, and an oblique-side portion of each of the n radially outer-side terminals, which are continuous in the circumferential direction and are bent in the circumferential bending direction, and an end surface of the stator core monotonously decreases in the circumferential bending direction.
According to one embodiment of the present invention, the phase winding is formed by directly joining the distal end portions of the radially inner-side terminals, which extend from the slots being separate from each other by the n slots and are bent so as to be brought closer to each other, and directly joining the distal end portions of the radially outer-side terminals respectively extending from the slots being separate from each other by the n slots to be bent so as to be brought closer to each other. In this manner, the radially inner-side terminals and the radially outer-side terminals are not required to be caused to pass on an axially outer side of a coil end group, thereby being capable of reducing an axial dimension of the stator. Further, another component such as a bus bar for connecting the terminals of the winding bodies is not required, thereby being capable of reducing the number of components of the stator.
Further, the first angle formed between at least one of the oblique-side portion of each of the n radially inner-side terminals, which are continuous in the circumferential direction and are bent in the same circumferential bending direction, and the oblique-side portion of each of the n radially outer-side terminals, which are continuous in the circumferential direction and are bent in the same circumferential bending direction, and the end surface of the stator core monotonously decreases in the circumferential bending direction. Thus, a distance between the oblique-side portions adjacent to each other in the circumferential direction increases, thereby enhancing the insulating property.
Now, with reference to the drawings, a rotating electric machine according to exemplary embodiments of the present invention is described.
In
The rotor 5 is a permanent magnet rotor including a rotor core 7 and permanent magnets 8. The rotor core 7 is firmly fixed to the rotary shaft 6 inserted therethrough at an axial center position. The permanent magnets 8 are embedded in the stator core 7 on an outer peripheral surface side of the stator core 7 and are arranged at equal pitches in a circumferential direction of the rotor 5 to form magnetic poles. The rotor 5 is not limited to the permanent magnet rotor, and may be a squirrel-cage rotor in which an uninsulated rotor conductor is accommodated in slots of the rotor core and both sides thereof are short-circuited with use of a short-circuit ring or a winding rotor in which an insulated conductor wire is mounted to the slots of the rotor core.
Next, a configuration of the stator 10 is specifically described with reference to
The stator 10 includes, as illustrated in
For convenience of the description, a pole number p of the rotor 5 is set to 10, a slot number S of the stator core 11 is set to 60, and the stator winding 20 is set to a three-phase winding. Specifically, the slots 12 are formed in the stator core 11 in a proportion of two slots per phase for each pole. In
The stator core 11 is formed by, as illustrated in
The winding bodies 21 for forming the stator core 20 include first winding bodies 21A and second winding bodies 21b. The first winding body 21A and the second winding body 21B have different directions in which terminals extend. Each of the first winding body 21A and the second winding body 21B is a hexagonal coil formed by helically winding a conductor wire 19 having a circular cross section with a diameter d two turns into an approximately hexagonal shape. The conductor wire 19 is formed of, for example, a copper wire or an aluminum wire, which is continuous without a connecting portion and is insulation-coated with an enamel resin. Specifically, each of the first winding body 21A and the second winding body 21B is a winding body formed by distributed winding and lap winding. Each of the winding bodies 21 may be formed of a conductor wire having a rectangular cross section in place of the conductor wire 19 having the circular cross section.
The first winding body 21A includes, as illustrated in
The first coil end 21c extends outward in a length direction of the first straight portion 21a and the second straight portion 21b from one end of the first straight portion 21a in one of the rows toward the second straight portion 21b in another one of the rows, is bent at the center between the row of the first straight portion 21a and the row of the second straight portion 21b to be displaced radially inward by 2d, and is then bent to extend inward in the length direction of the first straight portion 21a and the second straight portion 21b toward the second straight portion 21b in the another one of the rows to be connected to one end of the second straight portion 21b in the another one of the rows.
Similarly, the second coil end 21d extends outward in a length direction of the first straight portion 21a and the second straight portion 21b from another end of the second straight portion 21b in another one of the rows toward the first straight portion 21a in another one of the rows, is bent at the center between the row of the first straight portion 21a and the row of the second straight portion 21b to be displaced radially outward by d, and is then bent to extend inward in the length direction of the first straight portion 21a and the second straight portion 21b toward the first straight portion 21a in one of the rows to be connected to another end of the first straight portion 21a in one of the rows.
The radially inner-side terminal 21e extends from the another end of the second straight portion 21b, which is located on the radially inner side, toward the first straight portion 21a in the one row so as to be approximately parallel to the second coil end 21d, is bent at the approximate center between the row of the first straight portion 21a and the row of the second straight portion 21b to extend outward in the length direction of the first straight portion 21a and the second straight portion 21b. The radially-outer terminal 21f extends from the another end of the first straight portion 21a, which is located on the radially outer side, toward the second straight portion 21b in the another one of the rows so as to be approximately parallel to the second coil end 21d and is bent at the approximate center between the row of the first straight portion 21a and the row of the second straight portion 21b to extend outward in the length direction of the first straight portion 21a and the second straight portion 21b.
The first winding body 21a having the configuration described above is accommodated in a first layer and a second layer from the radially outer side in one slot 12, and the second straight portion 21b is accommodated in a third layer and a fourth layer from the radially outer side in the slot 12, which is separate from the one slot 12 by the six-slot-angle distance. The radially outer-side terminal 21f extends to a vicinity of top of the second coil end 21d while maintaining the same radial position as that of the first straight portion 21a accommodated in the first layer from the radially outer side in the one slot 12. The radially inner-side terminal 21e extends to the vicinity of the top of the second coil end 21d while maintaining the same radial position as that of the second straight portion 21b accommodated in the fourth layer from the radially outer side in the slot 12, which is separate from the one slot 12 by the six-slot-angle distance.
The second winding body 21B includes, as illustrated in
The first coil end 21c extends outward in a length direction of the first straight portion 21a and the second straight portion 21b from one end of the first straight portion 21a in one of the rows toward the second straight portion 21b in another one of the rows, is bent at the center between the row of the first straight portion 21a and the row of the second straight portion 21b to be displaced radially inward by 2d, and is then bent to extend inward in the length direction of the first straight portion 21a and the second straight portion 21b toward the second straight portion 21b in the another one of the rows to be connected to one end of the second straight portion 21b in the another one of the rows.
Similarly, the second coil end 21d extends outward in a length direction of the first straight portion 21a and the second straight portion 21b from another end of the second straight portion 21b in another one of the rows toward the first straight portion 21a in one of the rows, is bent at the center between the row of the first straight portion 21a and the row of the second straight portion 21b to be displaced radially outward by d, and is then bent to extend inward in the length direction of the first straight portion 21a and the second straight portion 21b toward the first straight portion 21a in the one of the rows to be connected to another end of the first straight portion 21a in the one of the rows.
After the radially inner-side terminal 21g is bent at a displacement portion 21i extending from the another end of the second straight portion 21b located on the radially inner side to be displaced radially inward by d, the radially inner-side terminal 21g extends approximately in parallel to a portion of the second coil end 21d, which extends from the another end of the first straight portion 21a to the center between the row of the first straight portion 21a and the row of the second straight portion 21b. After that, the radially inner-side terminal 21g is bent to extend outward in the length direction of the first straight portion 21a and the second straight portion 21b. After the radially outer-side terminal 21h is bent at a displacement portion 21j extending from the another end of the first straight portion 21a located on the radially outer side to be displaced radially outward by d, the radially outer-side terminal 21h extends approximately in parallel to a portion of the second coil end 21d, which extends from the another end of the second straight portion 21b to the center between the row of the first straight portion 21a and the row of the second straight portion 21b. After that, the radially outer-side terminal 21h is bent to extend outward in the length direction of the first straight portion 21a and the second straight portion 21b.
In the second winding body 21B having the configuration described above, the first straight portion 21a is accommodated in a first layer and a second layer from the radially outer side in one slot 12, and the second straight portion 21b is accommodated in a third layer and a fourth layer from the radially outer side in the slot 12, which is separate from the one slot 12 by the six-slot-angle distance. After the radially outer-side terminal 21h is displaced radially outward by d at the displacement portion 21j with respect to the first straight portion 21a accommodated in the first layer from the radially outer side in the one slot 12, the radially outer-side terminal 21h extends outward in a circumferential direction of the second winding body 21B. After the radially inner-side terminal 21g is displaced radially inward by d at the displacement portion 21i with respect to the second straight portion 21b accommodated in the fourth layer from the radially outer side in the slot 12, which is separate from the one slot by the six-slot angle distance, the radially inner-side terminal 21g extends outward in the circumferential direction of the second winding body 21B.
Next, a method of mounting the first winding bodies 21A and the second winding bodies 21B to the stator core 11 is described with reference to
First, the winding body 21 is formed by helically winding the conductor wire 19 two turns. For convenience of the description, the winding bodies 21 are denoted as a winding body 211, a winding body 212, a winding body 213 . . . a winding body 2159, and a winding body 2160 in the order of assembly.
Then, as illustrated in
Subsequently, as illustrated in
The first winding bodies 21A are used for first to sixth, thirteenth to eighteenth, twenty-fifth to thirtieth, thirty-seventh to forty-second, and fourth-ninth to fifty-fourth windings 21, and the second winding bodies 21B are used for seventh to twelfth, nineteenth to twenty-fourth, thirty-first to thirty-sixth, forty-third to forty-eighth, and fifty-fifth to sixtieth winding bodies 21.
As described above, sets of six first winding bodies 21A and sets of six second winding bodies 21B are alternately mounted to the stator core 11. The radially inner-side terminal 21e of each of the first winding bodies 21A maintains a fourth radial position from the radially outer side in the slot 12, whereas the radially outer-side terminal 21f maintains a first radial position from the radially outer side in the slot 12. Further, the radially inner-side terminal 21g of each of the second winding bodies 21B is displaced radially inward from the fourth radial position from the radially outer side in the slot 12 by the width d of the conductor 19, whereas the radially outer-side terminal 21h is displaced radially outward from the first radial position from the radially outer side in the slot 12 by the width d of the conductor 19.
In the manner described above, the radially inner-side terminals 21e and 21g project toward a radially inner side of a coil end group 20a, whereas the radially outer-side terminals 21f and 21h project toward a radially outer side of the coil end group 20a. As illustrated in
In the set of six terminal pairs arranged in the circumferential direction, in which the distal end portions of the radially outer-side terminals 21f of the first winding bodies 21A and the distal end portions of the radially outer-side terminals 21h of the second winding bodies 21B, which are separate from each other by 180 degrees in electrical angle, are arranged so as to be held in contact with each other in the radial direction, as illustrated in
More specifically, as illustrated in
Meanwhile, when six radially outer-side terminals 21h are denoted for convenience as a radially outer-side terminal 21h1, a radially outer-side terminal 21h2, a radially outer-side terminal 21h3 . . . , and a radially outer-side terminal 21h6 in the order of arrangement in the first circumferential direction, the first angle θ formed between a surface of the oblique-side portion 21hs of the radially outer-side terminal 21h1, 21h2, 21h3 . . . 21h6, which is oriented forward in the second circumferential direction, and the end surface of the stator core 11 gradually decreases in the second circumferential direction, which is a bending direction of the oblique-side portions 21hs of the radially outer-side terminals 21h.
A distal end portion 21fa of the radially outer-side terminal 21f and a distal end portion 21ha of the radially outer-side terminal 21h, which are held in contact with each other in the radial direction, are located at the same height position from the end surface of the stator core 11.
Although not illustrated, even in the sets, each including six terminal pairs arranged in the circumferential direction so that the distal end portion of the radially inner-side terminal 21e of the first winding body 21A and the distal end portion of the radially inner-side terminal 21g of the second winding body 21B of each terminal pair, which are separate from each other by 180 degrees in electrical angle, are held in contact with each other in the radial direction, an oblique-side portion of each of the radially inner-side terminals 21e and an oblique-side portion of a corresponding one of the radially inner-side terminals 21g cross each other when viewed from the radially inner side.
Meanwhile, when six radially inner-side terminals 21e are denoted for convenience as a radially inner-side terminal 21e1, a radially inner-side terminal 21e2, a radially inner-side terminal 21e3 . . . , and a radially inner-side terminal 21e6 in the order of arrangement in the second circumferential direction, the first angle θ formed between a surface of the oblique-side portion of the radially inner-side terminal 21e1, 21e2, 21e3 . . . 21e6, which is oriented forward in the second circumferential direction, and the end surface of the stator core 11 gradually decreases in the second circumferential direction, which is a bending direction of the oblique-side portions of the radially inner-side terminals 21e. Further, when six radially inner-side terminals 21g are denoted for convenience as a radially inner-side terminal 21g1, a radially inner-side terminal 21g2, a radially inner-side terminal 21g3 . . . , and a radially inner-side terminal 21g6 in the order of arrangement in the first circumferential direction, the first angle θ formed between a surface of the oblique-side portion 21gs of the radially inner-side terminal 21gg1, 21g2, 21g3 . . . 21g6, which is oriented forward in the first circumferential direction, and the end surface of the stator core 11 gradually decreases in the first circumferential direction, which is a bending direction of the oblique-side portions of the radially outer-side terminals 21g. A distal end portion of the radially inner-side terminal 21e and a distal end portion of the radially inner-side terminal 21g, which are held in contact with each other in the radial direction, are located at the same height position from the end surface of the stator core 11.
Next, a wire connection method for the stator winding 20 is described with reference to
In
The winding bodies 21 are mounted to a group of slots with slot numbers (3+6n) to form a V1-phase winding. The winding bodies 21 are mounted to a group of slots with slot numbers (4+6n) to form a V2-phase winding. The winding bodies 21 are mounted to a group of slots with slot numbers (5+6n) to form a W1-phase winding. The winding bodies 21 are mounted to a group of slots with slot numbers (6+6n) to form a W2-phase winding. The wire connection is performed in the same manner for the U-phase winding, the V-phase winding, and the W-phase winding. Thus, the wire connection method is described only for the U-phase winding.
First, as illustrated in
Next, as illustrated in
The V-phase winding and the W-phase winding are formed in a similar manner. The neutral points are wire-connected to obtain the stator winding 20 formed as a three-phase AC winding in which the U-phase winding, the V-phase winding, and the W-phase winding are wire-connected in a Y-connection configuration.
A wire connection state of the stator winding 20 of the stator 10, which is formed as described above, is described with reference to
In the stator 10, as illustrated in
The rotating electric machine 100 using the stator 10 obtained by the wire connection described above operates as a 10-pole, 60-slot inner rotor three-phase motor with AC power fed to the stator winding 20.
As described above, according to the first embodiment, sixty (the same number as a total number of slots) winding bodies 21 formed by distributed winding and lap winding are mounted to the stator core 11 at one-slot pitches. Then, the winding bodies 21 are formed so that the radially inner-side terminals 21e and 21g, each being one end of the conductor 19, extend from a radially innermost position in the slot 12 toward the one axial side of the stator core 11 and the radially outer-side terminals 21f and 21h, each being another end of the conductor 19, extend from a radially outermost position in the slot 12 toward the one axial side of the stator core 11. Further, each phase winding of the stator winding 20 is formed by directly joining the radially inner-side terminals 21e and 21g of the winding bodies 21 for forming the same phase to each other and directly joining the radially outer-side terminals 21f and 21h thereof to each other.
Thus, the radially inner-side terminals 21e and 21g and the radially outer-side terminals 21f and 21h are not required to be caused to pass on an axially outer side of the coil end group 20a. Thus, an axial dimension of the stator 10 can be reduced.
Further, another component such as a bus bar, which is configured to connect the terminals of the winding bodies 21 to each other, is not required. Thus, the number of components of the stator 10 can be reduced.
The radially inner-side terminal 21e of the first winding body 21A maintains the fourth radial position in the slot 12 from the radially outer side, and the radially outer-side terminal 21f maintains the first radial position in the slot 12 from the radially outer side. The radially inner-side terminal 21g of the second winding body 21B is displaced radially inward from the fourth radial position in the slot 12 from the radially outer side by the width d of the conductor wire 19, and the radially outer-side terminal 21h thereof is displaced radially outward from the first radial position in the slot 12 from the radially outer side by the width d of the conductor wire 19. In this manner, the radially inner-side terminal 21g can be led in the circumferential direction without interference with the radially inner-side terminal 21e so that an end of the radially inner-side terminal 21g is joined to an end of the radially inner-side terminal 21e, which is a target to be joined. Further, the radially outer-side terminal 21h can be led in the circumferential direction without interference with the radially outer-side terminal 21f so that an end of the radially outer-side terminal 21h is joined to an end of the radially outer-side terminal 21f, which is a target to be joined. Thus, radial projection of the coil end group 20a can be reduced.
Six radially outer-side terminals 21f and six radially outer-side terminal 21h, which extend from the radially outermost position in the slots 12, are arranged so that a group of the six radially outer-side terminals 21f and a group of the six radially outer-side terminals 21h are arranged alternately in the circumferential direction. The six radially outer-side terminals 21f extend from the slots 12 and are then bent in the first circumferential direction. The six radially outer-side terminals 21h extend from the slots 12 and are then bent in the second circumferential direction so as to be brought closer to the radially outer-side terminals 21f being targets to be connected, which are separate from the radially outer-side terminals 21h by six slots, to be connected to the radially outer-side terminals 21f being the targets to be connected. Specifically, the radially outer-side terminals 21f and 21h are bent in the different circumferential directions for every six slots. In the set of six radially outer-side terminals 21f and six radially outer-side terminals 21h in which the group of the six radially outer-side terminals 21f and the group of the six radially outer-side terminals 21h are adjacent to each other in the circumferential direction, each of the radially outer-side terminals 21f and a corresponding one of the radially outer-side terminals 21h are bent so as to be brought closer to each other. Further, in the set of the six radially outer-side terminals 21f and the six radially outer-side terminals 21h in which the group of the six radially outer-side terminals 21f and the group of the six radially outer-side terminals 21h are adjacent to each other in the circumferential direction, the first angle θ formed between the surface of the oblique-side portion 21fs of the radially outer-side terminal 21f, which is oriented forward in the first circumferential direction, and the end surface of the stator core 11 gradually decreases in the first circumferential direction. Further, the first angle θ formed between the surface of the oblique-side portion 21hs of the radially outer-side terminal 21h, which is oriented forward in the second circumferential direction, and the end surface of the stator core 11 gradually decreases in the second circumferential direction. As a result, a distance between the oblique-side portions 21fs of the radially outer-side terminals 21f adjacent to each other and a distance between the oblique-side portions 21hs of the radially outer-side terminals 21h adjacent to each other can be increased. Hence, an insulating property can be improved. Further, a distance between the connecting portions, each being formed between the distal end portion 21fa of the radially outer-side terminal 21f and the distal end portion 21ha of the radially outer-side terminal 21h, which are adjacent to each other, can be increased. Hence, the insulating property can be improved.
Six radially inner-side terminals 21e and six radially inner-side terminal 21g, which extend from the radially innermost position in the slots 12, are arranged so that a group of the six radially inner-side terminals 21e and a group of the six radially inner-side terminals 21g are arranged alternately in the circumferential direction. The six radially inner-side terminals 21e extend from the slots 12 and are then bent in the second circumferential direction. The six radially inner-side terminals 21g extend from the slots 12 and are then bent in the first circumferential direction so as to be brought closer to the radially inner-side terminals 21e being targets to be connected, which are separate from the radially inner-side terminals 21g by six slots, to be connected to the radially inner-side terminals 21e being the targets to be connected. Specifically, the radially inner-side terminals 21e and 21g are bent in the different circumferential directions for every six slots. In the set of six radially inner-side terminals 21e and six radially inner-side terminals 21g in which the group of the six radially inner-side terminals 21e and the group of the six radially inner-side terminals 21g are adjacent to each other in the circumferential direction, each of the radially inner-side terminals 21e and a corresponding one of the radially inner-side terminals 21g are bent so as to be brought closer to each other. Further, in the set of the six radially inner-side terminals 21e and the six radially inner-side terminals 21g in which the group of the six radially inner-side terminals 21e and the group of the six radially inner-side terminals 21g are adjacent to each other in the circumferential direction, the first angle θ formed between the surface of the oblique-side portion 21fs of the radially inner-side terminal 21e, which is oriented forward in the second circumferential direction, and the end surface of the stator core 11 gradually decreases in the second circumferential direction. Further, the first angle θ formed between the surface of the oblique-side portion 21hs of the radially inner-side terminal 21g, which is oriented forward in the first circumferential direction, and the end surface of the stator core 11 gradually decreases in the first circumferential direction. As a result, a distance between the oblique-side portions of the radially inner-side terminals 21e adjacent to each other and a distance between the oblique-side portions of the radially inner-side terminals 21g adjacent to each other can be increased. Hence, an insulating property can be improved. Further, a distance between the connecting portions, each being formed between the distal end portion of the radially inner-side terminal 21e and the distal end portion of the radially inner-side terminal 21g, which are adjacent to each other, can be increased. Hence, the insulating property can be improved.
In the first embodiment described above, the first angle θ formed between the oblique-side portion of the radially outer-side terminal and the end surface of the stator core and between the oblique-side portion of the radially inner-side terminal and the end surface of the stator core gradually decreases in a direction of being brought closer to the terminal to be joined. When insulating performance has a margin, the first angle θ may be the same for a plurality of the oblique-side portions as long as the first angle θ monotonously decreases in the direction of being brought closer to the terminal to be joined. For example, in
In
Other configurations are the same as those of the first embodiment described above.
Even in the second embodiment, the first angle θ formed between the surface of the oblique-side portion 21fs of the radially outer-side terminal 21f, which is oriented forward in the first circumferential direction, and the end surface of the stator core 11, gradually decreases in the first circumferential direction, and a distance between the oblique-side portions 21fs of the radially outer-side terminals 21f adjacent to each other increases. Thus, the thermistor 50 can be stably installed under a state of being held in contact with the oblique-side portion 21fs of the radially outer-side terminal 21f. At the same time, a temperature of a coil end can be precisely measured.
In
Other configurations are the same as those of the first embodiment described above.
According to the third embodiment, the distances L1, L2, L3, L4, and L5 between the pairs of the distal end portions, each including the distal end portion 21fa of the radially outer-side terminal 21f and the distal end portion 21ha of the radially outer-side terminal 21h, are the same, and the height positions of the distal end portions 21fa of the radially outer-side terminals 21f and the distal end portions 21ha of the radially outer-side terminals 21h from the end surface of the stator core 11 are the same for the pairs. Thus, a step of connecting the distal end portion 21fa of the radially outer-side terminal 21f and the distal end portion 21ha of the radially outer-side terminal 21h is simplified. At the same time, stable joint strength can be obtained.
In the third embodiment, in the set of the six radially outer-side terminals 21f and the six radially outer-side terminals 21h in which the group of the six radially outer-side terminals 21f and the group of the six radially outer-side terminals 21h are adjacent to each other in the circumferential direction, the first angle θ formed between the surface of the oblique-side portion 21fs of the radially outer-side terminal 21f, which is oriented forward in the first circumferential direction, and the end surface of the stator core 11 gradually decreases in the first circumferential direction. Further, the first angle θ formed between the surface of the oblique-side portion 21hs of the radially outer-side terminal 21h, which is oriented forward in the second circumferential direction, and the end surface of the stator core 11 gradually decreases in the second circumferential direction. Thus, a height position of a bent portion of the oblique-side portion 21fs, at which the distal end portion 21fa of the radially outer-side terminal 21f is defined, from the end surface of the stator core 11 is gradually decreased in the first circumferential direction. Further, a height position of a bent portion of the oblique-side portion 21hs, at which the distal end portion 21ha of the radially outer-side terminal 21h is defined, from the end surface of the stator core 11 is gradually decreased in the second circumferential direction. In this manner, the height positions of the connecting portions, each being formed between the distal end portion 21fa of the radially outer-side terminal 21f and the distal end portion 21ha of the radially outer-side terminal 21h, are set to be the same. Further, the distances between the pairs, each including the distal end portion 21fa of the radially outer-side terminal 21f and the distal end portion 21ha of the radially outer-side terminal 21h, are set to be the same.
The radially outer-side terminals 21f and 21h have been described. However, the radially inner-side terminals 21e and 21g are formed in a similar manner.
In the third embodiment, the configuration applied to the rotating electric machine according to the first embodiment has been described. However, the configuration may be applied to a rotating electric machine according to other embodiments.
In
Other configurations are the same as those of the first embodiment described above.
According to the fourth embodiment, a distance between the oblique-side portions of the second coil ends 21d adjacent to each other in the circumferential direction is increased. Hence, the insulating property can be improved.
The second coil ends 21d have been described. However, even for a first angle formed between each of a pair of oblique-side portions through top of a first coil end 21c therebetween and the end surface of the stator core, similarly to the second coil end 21d, the first angle formed between the surface oriented forward in a bending direction of the oblique-side portion and the end surface of the stator core monotonously decreases in the bending direction.
In the fourth embodiment, the configuration applied to the rotating electric machine according to the first embodiment has been described. However, the configuration may be applied to a rotating electric machine according to other embodiments.
The third embodiment has the same configuration as that of the first embodiment described above except for a difference in the wire connection method for the stator winding.
First, as illustrated in
Further, as illustrated in
The V-phase winding and the W-phase winding are formed in a similar manner. The neutral points are wire-connected to obtain the stator winding formed as a three-phase AC winding in which the U-phase winding, the V-phase winding, and the W-phase winding are wire-connected in a Y-connection configuration.
Even in the fifth embodiment, the winding bodies 21 are mounted to the stator core at one-slot pitches so that the radially inner-side terminals 21e and 21g of the winding bodies 21 project toward the radially inner side of the coil end group 20a and the radially outer-side terminals 21f and 21h of the radially outer-side terminals 21f and 21h project toward the radially outer side of the coil end group 20a. Then, the radially inner-side terminals 21e and 21g of the winding bodies 21 for forming the same phase are directly joined to each other and the radially outer-side terminals 21f and 21h thereof are directly joined to each other to form each phase winding.
The radially outer-side terminals 21f and 21h are bent in the different circumferential directions for every six slots. In the set of six radially outer-side terminals 21f and six radially outer-side terminals 21h in which the group of the six radially outer-side terminals 21f and the group of the six radially outer-side terminals 21h are adjacent to each other in the circumferential direction, each of the radially outer-side terminals 21f and a corresponding one of the radially outer-side terminals 21h are bent so as to be brought closer to each other. Further, in the set of the six radially outer-side terminals 21f and the six radially outer-side terminals 21h in which the group of the six radially outer-side terminals 21f and the group of the six radially outer-side terminals 21h are adjacent to each other in the circumferential direction, the first angle θ formed between the surface of the oblique-side portion of the radially outer-side terminal 21f, which is oriented forward in the first circumferential direction, and the end surface of the stator core 11 gradually decreases in the first circumferential direction. Further, the first angle θ formed between the surface of the oblique-side portion of the radially outer-side terminal 21h, which is oriented forward in the second circumferential direction, and the end surface of the stator core 11 gradually decreases in the second circumferential direction.
The radially inner-side terminals 21e and 21g are bent in the different circumferential directions for every six slots. In the set of six radially inner-side terminals 21e and six radially inner-side terminals 21g in which the group of the six radially inner-side terminals 21e and the group of the six radially inner-side terminals 21g are adjacent to each other in the circumferential direction, each of the radially inner-side terminals 21e and a corresponding one of the radially inner-side terminals 21g are bent so as to be brought closer to each other. Further, in the set of the six radially inner-side terminals 21e and the six radially inner-side terminals 21g in which the group of the six radially inner-side terminals 21e and the group of the six radially inner-side terminals 21g are adjacent to each other in the circumferential direction, the first angle θ formed between the surface of the oblique-side portion of the radially inner-side terminal 21e, which is oriented forward in the second circumferential direction, and the end surface of the stator core 11 gradually decreases in the second circumferential direction. Further, the first angle θ formed between the surface of the oblique-side portion 21hs of the radially inner-side terminal 21g, which is oriented forward in the first circumferential direction, and the end surface of the stator core 11 gradually decreases in the first circumferential direction.
Accordingly, even in the fifth embodiment, the same effects as those of the first embodiment described above are obtained.
In
Other configurations are the same as those of the first embodiment described above.
According to the sixth embodiment, the radially inner-side terminals 21e and 21g are inclined to the radially inner side, and hence the bead 15 serving as the connecting portion for the pair of the radially inner-side terminals 21e and 21g is separated from the coil end group 20a to the radially inner side. The radially outer-side terminals 21f and 21h are inclined to the radially outer side, and hence the bead 15 serving as the connecting portion for the pair of the radially outer-side terminals 21f and 21h is separated from the coil end group 20a to the radially outer side. With the configuration described above, the axial height of the terminals of the winding bodies 21 can be reduced. Further, generation of damage of the insulating coating for the conductor wire for forming the coil ends, which may be caused by fire of a torch or sputtering at the time of joint between the pair of the radially outer-side terminals 21f and 21h, can be suppressed.
In the sixth embodiment, the configuration applied to the rotating electric machine according to the first embodiment has been described. However, the configuration may be applied to a rotating electric machine according to other embodiments.
In the seventh embodiment, as illustrated in part (a) of
Other configurations are the same as those of the first embodiment described above.
According to the seventh embodiment, the insulating sheets 16 are arranged between the radially inner-side terminals 21e and 21g of different phases, which cross each other when viewed from the radial direction, and between the radially outer-side terminals 21f and 21h of different phases, which cross each other when viewed from the radial direction, respectively. Thus, phase-to-phase insulation is ensured, and hence the stator having a high insulating property is obtained.
In the first to seventh embodiments described above, the winding body is formed by helically winding the conductor wire two turns. However, the number of turns of the conductor wire is not limited to two, and may be any number equal to or larger than two.
In the seventh embodiment, the configuration applied to the rotating electric machine according to the first embodiment has been described. However, the configuration may be applied to a rotating electric machine according to other embodiments.
In
A core block 31 is obtained by, as illustrated in
Winding bodies 42 for forming the stator winding 40 include first winding bodies 42A and a second winding bodies 42B. In the first winding bodies 42 and the second winding bodies 42B, terminals extend in different directions. Each of the first winding body 42A and the second winding body 42B is formed by inserting a conductor wire 39 having a circular cross section with the diameter d, which is formed of, for example, a copper wire or an aluminum wire, which is insulation-coated with an enamel resin and is continuous without any connecting portions, into a first slot, a second slot, and a third slot, which are arranged at six-slot-angle distances in the circumferential direction. The conductor wire 39 is inserted into the first slot, the second slot, the third slot, and the second slot in the started order so that an insertion direction into the first slot, the second slot, and the third slot from an axial direction are changed alternately to form each of the first winding body 42A and the second winding body 42B into a δ-shaped coil pattern. The winding body 42 may also be formed with use of a conductor wire having a rectangular cross section in place of the conductor wire 39 having the circular cross section.
The first winding body 42A includes, as illustrated in
More specifically, the first winding body 42A is formed into the δ-shaped coil pattern in the following manner, as illustrated in
Positions of accommodation of the conductor wire 39 accommodated in the slot 32 are referred to as the first layer, the second layer, the third layer, and the fourth layer from the radially outer side for convenience. In
The first straight portion 42a is accommodated in the first layer in the first slot 32, the second straight portion 42b and the fourth straight portion 42d are accommodated in the second layer and the fourth layer in the seventh slot 32, and the third straight portion 42c is accommodated in the third layer in the thirteenth slot 32. Specifically, the first straight portion 42a, the second straight portion 42b, the third straight portion 42c, and the fourth straight portion 42d are arranged in the three rows located at the six-slot-angle distances.
The first coil end 42e extending from the first layer in the first slot 32 to the another axial end side of the stator core 30 extends axially outward to another circumferential side at a constant inclination while maintaining a radial position, is displaced radially inward by d at a center (top), and then extends axially inward in the second circumferential direction at an inclination in the opposite direction while maintaining the radial position to be inserted into the second layer in the seventh slot 32.
The second coil end 42f extending from the second layer in the seventh slot 32 to the one axial end side of the stator core 30 extends axially outward in the second another circumferential direction at a constant inclination while maintaining a radial position, is displaced radially inward by d at a center (top), and then extends axially inward in the second circumferential direction at an inclination in the opposite direction while maintaining the radial position to be inserted into the third layer in the thirteenth slot 32.
The third coil end 42g extending from the third layer in the thirteenth slot 32 to the another axial end side of the stator core 30 extends axially outward in the first circumferential direction at a constant inclination while maintaining a radial position, is displaced radially inward by d at a center (top), and then extends axially inward in the first circumferential direction at an inclination in the opposite direction while maintaining the radial position to be inserted into the fourth layer in the seventh slot 32.
As described above, each of the first coil end 42e, the second coil end 42f, and the third coil end 42g has a crank portion, which is displaced in the radial direction by the radial width of the conductor wire 39, at the top.
The radially outer-side terminal 42h, which extends from the first layer in the first slot 32 to the one axial end side of the stator core 30, as illustrated in
The radially inner-side terminal 42i, which extends from the fourth layer in the seventh slot 32 to the one axial end side of the stator core 30, as illustrated in
The second winding body 42B includes, as illustrated in
In the second winding body 42B, similarly to the first winding body 42A, the first straight portion 42a is accommodated in the first layer in the first slot 32, the second straight portion 42b and the fourth straight portion 42d are accommodated in the second layer and the fourth layer in the seventh slot 32, and the third straight portion 42c is accommodated in the third layer in the thirteenth slot 32.
The radially outer-side terminal 42k, which extends from the first layer in the first slot 32 to the one axial end side of the stator core 30, as illustrated in
The radially inner-side terminal 42m, which extends from the fourth layer in the seventh slot 32 to the one axial end side of the stator core 30, as illustrated in
The first winding bodies 42A and the second winding bodies 42B, which are formed as described above, are arranged in the circumferential direction at one-slot pitches so that a group of six first winding bodies 42A and a group of six second winding bodies 42B are arranged alternately in the circumferential direction to thereby form a winding assembly 41 having an annular shape, which is illustrated in
In the winding assembly 41 formed as described above, the first straight portion 42a, the second straight portion 42b, the third straight portion 42c, and the fourth straight portion 42d are arranged in one row in the radial direction, and sixty rows are arranged in the circumferential direction at one-slot pitches.
On one axial end side of the winding assembly 41, a second coil end row formed by arranging the second coil ends 42f in the circumferential direction at one-slot pitches forms a first coil end group 41a. On another axial end side of the winding assembly 41, a second coil end group 41b is formed. The second coil end group 41b includes a first coil end row and a third coil end row, which are two rows arranged in the radial direction. The first coil end row is formed by arranging the first coil ends 42e in the circumferential direction at one-slot pitches. The third coil end row is formed by arranging the third coil ends 42g in the circumferential direction at one-slot pitches.
Each terminal pair includes the first winding body 42A and the second winding body 42B, which are separate from each other by 180 degrees in electrical angle so that an end of the radially outer-side terminal 42h of the first winding body 42A and an end of the radially outer-side terminal 42k of the second winding body 42B are held in contact with each other in the radial direction. Four sets, each including the six terminal pairs described above arranged in the circumferential direction, are arranged on the radially outer side of the first coil end group 41a so as to be separate from each other in the circumferential direction. Further, each terminal pair includes the first winding body 42A and the second winding body 42B, which are separate from each other by 180 degrees in electrical angle so that an end of the radially inner-side terminal 42i of the first winding body 42A and an end of the radially inner-side terminal 42m of the second winding body 42B are held in contact with each other in the radial direction. Five sets, each including the six terminal pairs described above arranged in the circumferential direction, are arranged on the radially inner side of the first coil end group 41a so as to be separate from each other in the circumferential direction.
In the set of six terminal pairs arranged in the circumferential direction, in which the distal end portions of the radially outer-side terminals 42h of the first winding bodies 42A and the distal end portions of the radially outer-side terminals 42k of the second winding bodies 42B, which are separate from each other by 180 degrees in electrical angle, are arranged so as to be held in contact with each other in the radial direction, as illustrated in
More specifically, as illustrated in
Meanwhile, when six radially outer-side terminals 42h of each of the sets are denoted as a radially outer-side terminal 42h1, a radially outer-side terminal 42h2, a radially outer-side terminal 42h3 . . . , and a radially outer-side terminal 42h6 in the order of arrangement in the second circumferential direction for convenience, the first angle θ formed between the oblique-side portion 42hs of each of the radially outer-side terminals 42h1, 42h2, 42h3 . . . , and 42h6, which is oriented forward in the second circumferential direction, and the end surface of the stator core 11 is constant. The second angle η formed between a surface of a distal end portion 42ha of the radially outer-side terminal 42h1, 42h2, 42h3 . . . , and 42h6, which is oriented forward in the second circumferential direction, and the end surface of the stator core 11 gradually decreases in the second circumferential direction. A height position of a bent portion of the oblique-side portion 42hs, at which the distal end portion 42ha of the radially outer-side terminal 42h is defined, from the end surface of the stator core 11 is set so as to gradually decrease in the second circumferential direction.
A distal end portion 42ha of the radially outer-side terminal 42k and a distal end portion 42ka of the radially outer-side terminal 42h, which are held in contact with each other in the radial direction, are located at the same height position from the end surface of the stator core 11.
Although not illustrated, even in the sets, each including six terminal pairs arranged in the circumferential direction so that the distal end portion of the radially inner-side terminal 42i of the first winding body 42A and the distal end portion of the radially inner-side terminal 42m of the second winding body 42B of each terminal pair, which are separate from each other by 180 degrees in electrical angle, are held in contact with each other in the radial direction, an oblique-side portion of each of the radially inner-side terminals 42i and an oblique-side portion of a corresponding one of the radially inner-side terminals 42m cross each other when viewed from the radially inner side.
More specifically, although not illustrated, when six radially inner-side terminals 42i of each of the sets are denoted as a radially inner-side terminal 42i1, a radially inner-side terminal 42i2, a radially inner-side terminal 42i3 . . . , and a radially inner-side terminal 42i6 in the order of arrangement in the first circumferential direction for convenience, the first angle θ formed between the oblique-side portion of each of the radially inner-side terminals 42i1, 42i2, 42i3 . . . , and 42i6, which is oriented forward in the first circumferential direction, and the end surface of the stator core 11 is constant. The second angle η formed between a surface of a distal end portion of the radially outer-side terminal 42i1, 42i2, 42i3 . . . , and 42i6, which is oriented forward in the first circumferential direction, and the end surface of the stator core 11 gradually decreases in the first circumferential direction. A height position of a bent portion of the oblique-side portion, at which the distal end portion of the radially inner-side terminal 42i is defined, from the end surface of the stator core 11 is set so as to gradually decrease in the first circumferential direction.
More specifically, although not illustrated, when six radially inner-side terminals 42m of each of the sets are denoted as a radially inner-side terminal 42m1, a radially inner-side terminal 42m2, a radially inner-side terminal 42m3 . . . , and a radially inner-side terminal 42m6 in the order of arrangement in the second circumferential direction for convenience, the first angle θ formed between the oblique-side portion of each of the radially inner-side terminals 42m1, 42m2, 42m3 . . . , and 42m6, which is oriented forward in the second circumferential direction, and the end surface of the stator core 11 is constant. The second angle η formed between a surface of a distal end portion of the radially inner-side terminal 42m1, 42m2, 42m3 . . . , and 42m6, which is oriented forward in the second circumferential direction, and the end surface of the stator core 11 gradually decreases in the second circumferential direction. A height position of a bent portion of the oblique-side portion, at which the distal end portion of the radially inner-side terminal 42m is defined, from the end surface of the stator core 11 is set so as to gradually decrease in the second circumferential direction.
A distal end portion 21fa of the radially inner-side terminal 42i and a distal end portion 21ha of the radially inner-side terminal 42m, which are held in contact with each other in the radial direction, are located at the same height position from the end surface of the stator core 11.
Next, an assembly method for the stator 10A is described with reference to
First, the slot cells 13 are mounted to the rows, each including the first straight portion 42a, the second straight portion 42b, the third straight portion 42c, and the fourth straight portion 42d, in the winding assembly 41. Next, the thirty core blocks 31 are arranged, as illustrated in
The core blocks 31 arranged in the circumferential direction is moved further to the radially inner side. Then, circumferential side surfaces of adjacent ones of the core blocks 31 are brought into abutment against each other to hamper radially inward movement of the core blocks 31. As a result, as illustrated in
Although not shown, a distance from an end surface of the stator core 30 to a bending start position (bending position in the circumferential direction) on the radially outer-side terminal 42k is longer than a distance from the end surface of the stator core 30 to a bending start position (bending position in the circumferential direction) at the displacement portion 42j of the radially outer-side terminal 42h. Further, a distance from the end surface of the stator core 30 to a bending start position (bending position in the circumferential direction) on the radially inner-side terminal 42i is longer than a distance from the end surface of the stator core 30 to a bending start position (bending position in the circumferential direction) at the displacement portion 42j of the radially inner-side terminal 42m.
According to the eighth embodiment, the same number as a total number of slots winding bodies 42 formed by distributed winding are mounted in the stator core 30 at one-slot pitches. Then, the winding bodies 42 are formed so that the radially inner-side terminals 42i and 42m, each being one end of the conductor 39, extend from a radially innermost position in the slot 32 toward the one axial side of the stator core 30 and the radially outer-side terminals 42h and 42k, each being another end of the conductor 39, extend from a radially outermost position in the slot 32 toward the one axial side of the stator core 30. Further, each phase winding of the stator winding 40 is formed by directly joining the radially inner-side terminals 42i and 42m of the winding bodies 42 for forming the same phase to each other and directly joining the radially outer-side terminals 42h and 42k thereof to each other.
Therefore, also in the eighth embodiment, the radially inner-side terminals 42i and 42m and the radially outer-side terminals 42h and 42k are not required to be caused to pass on an axially outer side of the first coil end group a. Thus, an axial dimension of the stator 10 can be reduced.
Further, another component such as a bus bar, which is configured to connect the terminals of the winding bodies 42 to each other, is not required. Thus, the number of components of the stator 10A can be reduced.
Further, the radially inner-side terminal 42i of the first winding body 42A maintains the fourth radial position from the radially outer side in the slot 32, and the radially outer-side terminal 42h is displaced radially inward from the first radial position from the radially outer side in the slot 32 by the width d of the conductor wire 39. The radially inner-side terminal 42m of the second winding body 42B is displaced radially inward from the fourth radial position from the radially outer side in the slot 32 by the width d of the conductor 39, and the radially outer-side terminal 42k maintains the first radial position from the radially outer side in the slot 32. In this manner, the radially inner-side terminal 42i can be led in the circumferential direction to be joined to a corresponding one of the radially inner-side terminals 42m without interference of the radially inner-side terminals 42m. Further, the radially outer-side terminal 42h can be led in the circumferential direction to be joined to a corresponding one of the radially outer-side terminals 42k without interference of the radially outer-side terminals 42k. Thus, radial projection of the second coil end group 41b can be reduced.
Six radially outer-side terminals 42k and six radially outer-side terminal 42h, which extend from the radially outermost position in the slots 12, are arranged so that a group of the six radially outer-side terminals 42k and a group of the six radially outer-side terminals 42h are arranged alternately in the circumferential direction. The six radially outer-side terminals 42k extend from the slots 12 and are then bent in the first circumferential direction. The six radially outer-side terminals 42h extend from the slots 12 and are then bent in the second circumferential direction so as to be brought closer to the radially outer-side terminals 42k being targets to be connected, which are separate from the radially outer-side terminals 42k by six slots, to be connected to the radially outer-side terminals 42k being the targets to be connected. Specifically, the radially outer-side terminals 42k and 42h are bent in the different circumferential directions for every six slots. In the set of six radially outer-side terminals 42k and six radially outer-side terminals 42h in which the group of the six radially outer-side terminals 42k and the group of the six radially outer-side terminals 42h are adjacent to each other in the circumferential direction, each of the radially outer-side terminals 42k and a corresponding one of the radially outer-side terminals 42h are bent so as to be brought closer to each other. Further, in the set of the radially outer-side terminals 42k and the radially outer-side terminals 42h, which are arranged so that a group of six radially outer-side terminals 42k and a group of six radially outer-side terminals 42h are adjacent to each other in the circumferential direction, the second angle η formed between the distal end portion 42ka of the radially outer-side terminal 42k and the end surface of the stator core 11 gradually decreases in the first circumferential direction, which is a bending direction of the oblique-side portions 42ks of the radially outer-side terminals 42k. Further, the second angle η formed between the distal end 42ha of the radially outer-side terminal 42h and the end surface of the stator core 11 gradually decreases in the second circumferential direction, which is a bending direction of the oblique-side portions 42hs of the radially outer-side terminals 42h. As a result, a distance between the connecting portions, each being formed between the distal end portion 42ha of the radially outer-side terminal 42h and the distal end portion 42ka of the radially outer-side terminal 42k adjacent to each other, which are held in contact with each other in the radial direction, can be increased. Thus, the insulating property can be improved.
Six radially inner-side terminals 42i and six radially inner-side terminal 42m, which extend from the radially innermost position in the slots 12, are arranged so that a group of the six radially inner-side terminals 42i and a group of the six radially inner-side terminals 42m are arranged alternately in the circumferential direction. The six radially inner-side terminals 42i extend from the slots 12 and are then bent in the first circumferential direction. The six radially inner-side terminals 42m extend from the slots 12 and are then bent in the second circumferential direction so as to be brought closer to the radially inner-side terminals 42i being targets to be connected, to be connected to the radially inner-side terminals 42i being the targets to be connected. Specifically, the radially inner-side terminals 42i and 42m are bent in the different circumferential directions for every six slots. In the set of six radially inner-side terminals 42i and six radially inner-side terminals 42m in which the group of the six radially inner-side terminals 42i and the group of the six radially inner-side terminals 42m are adjacent to each other in the circumferential direction, each of the radially inner-side terminals 42i and a corresponding one of the radially inner-side terminals 42m are bent so as to be brought closer to each other. Further, in the set of the radially inner-side terminals 42i and the radially inner-side terminals 42m, which are arranged so that a group of six radially outer-side terminals 42i and a group of six radially outer-side terminals 42m are adjacent to each other in the circumferential direction, the second angle η formed between the distal end portion of the radially inner-side terminal 42i and the end surface of the stator core 11 gradually decreases in the first circumferential direction, which is a bending direction of the oblique-side portions of the radially inner-side terminals 42i. Further, the first angle θ formed between the distal end of the radially inner-side terminal 42m and the end surface of the stator core 11 gradually decreases in the second circumferential direction, which is a bending direction of the oblique-side portions of the radially inner-side terminals 42m. As a result, a distance between the connecting portions, each being formed between the distal end portion of the radially inner-side terminal 42i and the distal end portion of the radially inner-side terminal 42 adjacent to each other, which are held in contact with each other in the radial direction, can be increased. Thus, the insulating property can be improved.
In the eighth embodiment described above, the second angle η formed between the distal portion of the radially outer-side terminal and the end surface of the stator core and between the distal portion of the radially inner-side terminal and the end surface of the stator core gradually decreases in a direction of being brought closer to the terminal to be joined. When insulating performance has a margin, the second angle η may be the same for a plurality of the oblique-side portions as long as the second angle η monotonously decreases in the direction of being brought closer to the terminal to be joined. For example, in
In the set of six terminal pairs arranged in the circumferential direction, in which the distal end portions of the radially outer-side terminals 42ha of the first winding bodies 42A and the distal end portions 42ka of the radially outer-side terminals 42k of the second winding bodies 42B, which are separate from each other by 180 degrees in electrical angle, are arranged so as to be held in contact with each other in the radial direction, as illustrated in
The first angle θ formed between the surface of the oblique-side portion 42ks of each of the six radially outer-side terminals 42k of each set, which is oriented forward in the first circumferential direction, and the end surface of the stator core 11 gradually decreases in the first circumferential direction. The second angle η formed between the surface of the oblique-side portion 42ka of the radially outer-side terminal 42k, which is oriented forward in the first circumferential direction, and the end surface of the stator core 11 gradually decreases in the first circumferential direction. Further, the height position of the bent portion of the oblique-side portion 42ks, at which the distal end portion 42ka of the radially outer-side terminal 42k is defined, from the end surface of the stator core 11 is gradually decreased in the first circumferential direction.
Meanwhile, the first angle θ formed between the surface of the oblique-side portion 42hs of each of the six radially outer-side terminals 42h of each set, which is oriented forward in the second circumferential direction, and the end surface of the stator core 11 gradually decreases in the second circumferential direction. The second angle η formed between the surface of the oblique-side portion 42ha of the radially outer-side terminal 42h, which is oriented forward in the second circumferential direction, and the end surface of the stator core 11 gradually decreases in the second circumferential direction. Further, the height position of the bent portion of the oblique-side portion 42hs, at which the distal end portion 42ha of the radially outer-side terminal 42h is defined, from the end surface of the stator core 11 is gradually decreased in the first circumferential direction.
A distal end portion 42ka of the radially outer-side terminal 42k and a distal end portion 42ha of the radially outer-side terminal 42h, which are held in contact with each other in the radial direction, are located at the same height position from the end surface of the stator core 11.
Although not illustrated, even in the sets, each including six terminal pairs arranged in the circumferential direction so that the distal end portion of the radially inner-side terminal 42i of the first winding body 42A and the distal end portion of the radially inner-side terminal 42m of the second winding body 42B of each terminal pair, which are separate from each other by 180 degrees in electrical angle, similarly, an oblique-side portion of each of the radially inner-side terminals 42i and an oblique-side portion of a corresponding one of the radially inner-side terminals 42m cross each other when viewed from the radially inner side.
The first angle θ formed between the surface of the oblique-side portion of each of the six radially outer-side terminals 42i of each set, which is oriented forward in the first circumferential direction, and the end surface of the stator core 11 gradually decreases in the first circumferential direction. The second angle η formed between the surface of the oblique-side portion of the radially outer-side terminal 42i, which is oriented forward in the first circumferential direction, and the end surface of the stator core 11 gradually decreases in the first circumferential direction. Further, the height position of the bent portion of the oblique-side portion, at which the distal end portion of the radially outer-side terminal 42i is defined, from the end surface of the stator core 11 is gradually decreased in the first circumferential direction.
The first angle θ formed between the surface of the oblique-side portion of each of the six radially outer-side terminals 42m of each set, which is oriented forward in the second circumferential direction, and the end surface of the stator core 11 gradually decreases in the second circumferential direction. The second angle η formed between the surface of the oblique-side portion of the radially outer-side terminal 42m, which is oriented forward in the second circumferential direction, and the end surface of the stator core 11 gradually decreases in the second circumferential direction. Further, the height position of the bent portion of the oblique-side portion, at which the distal end portion of the radially outer-side terminal 42m is defined, from the end surface of the stator core 11 is gradually decreased in the second circumferential direction.
Further, a distal end portion of the radially outer-side terminal 42i and a distal end portion of the radially outer-side terminal 42m, which are held in contact with each other in the radial direction, are located at the same height position from the end surface of the stator core 11.
Other configurations are the same as those of the eighth embodiment described above.
Accordingly, even in the ninth embodiment, the same effects as those of the eighth embodiment described above are obtained.
According to the ninth embodiment, the first angle θ formed between the surface of the oblique-side portion 42ks of each of the six radially outer-side terminals 42k of each set and the end surface of the stator core 11 gradually decreases in the first circumferential direction, which is the bending direction of the oblique-side terminals 42ks of the radially outer-side terminals 42k. Thus, a distance between the oblique-side portions 42ks of the radially outer-side terminals 42k adjacent to each other is increased to improve the insulating property. Similarly, the first angle θ formed between the surface of the oblique-side portion 42hs of each of the six radially outer-side terminals 42h of each set and the end surface of the stator core 11 gradually decreases in the second circumferential direction, which is the bending direction of the oblique-side portions 42hs of the radially outer-side terminals 42h. Thus, a distance between the oblique-side portions 42hs of the radially outer-side terminals 42h adjacent to each other is increased to improve the insulating property. The first angle θ formed between the oblique-side portion of each of the six radially inner-side terminals 42i of each set and the end surface of the stator core 11 gradually decreases in the first circumferential direction, which is the bending direction of the oblique-side portions of the radially inner-side terminals 42i. Thus, a distance between the oblique-side portions of the radially inner-side terminals 42i adjacent to each other is increased to improve the insulating property. Similarly, the first angle θ formed between the oblique-side portion of each of the six radially inner-side terminals 42m of each set and the end surface of the stator core 11 gradually decreases in the second circumferential direction, which is the bending direction of the oblique-side portions of the radially inner-side terminals 42m. Thus, a distance between the oblique-side portions of the radially inner-side terminals 42m adjacent to each other is increased to improve the insulating property.
In the eighth and ninth embodiments described above, the application of the present invention to the stator using the winding bodies 42 has been described. However, the present invention may be applied to the stator using the winding bodies 21.
In the eighth and ninth embodiments described above, each of the winding bodies 42 is formed by continuously winding the conductor wire 39 one turn into the δ-shaped coil pattern. However, the winding body may be formed by winding the conductor wire 39 two or more turns into the δ-shaped coil pattern. Specifically, the winding body may be formed by arranging the δ-shaped coil patterns (winding bodies 42) in two or more rows in the radial direction so as to be continuously formed with use of a jumper wire for connecting winding ends of the δ-shaped coil patterns.
In each of the embodiments described above, the application of the rotating electric machine to the electric motor has been described. However, the same effects are provided even when the rotating electric machine is applied to a power generator.
Further, in each of the embodiments described above, the rotating electric machine having ten poles and sixty slots has been described above. However, the pole number p and the slot number S are not limited to ten poles and sixty slots.
In each of the embodiments described above, the slots are formed in a proportion of two slots per phase for each pole. However, a slot number q per phase for each pole is not limited to two, and may be one, or three or more. For example, the slot number q per phase for each pole is one, a distance between the row of the first straight portion and the row of the second straight portion of the winding bodies is a three-slot-angle distance (one magnetic-pole pitch). In this case, the bending direction of the radially outer-side terminal extending from the radially outermost position of the slot is different in the circumferential direction for every three slots.
In each of the embodiments described above, each of the winding bodies is formed as a winding formed by full-pitch winding. However, each of the winding bodies may be formed as a winding formed by fractional-pitch winding or long-pitch winding.
In each of the embodiments described above, the winding body is formed of one continuous conductor wire. However, the winding body may be formed with use of a plurality of conductors connected to each other as long as distributed winding is used.
Further, in each of the embodiments described above, vanish is not applied to the coil end group. However, vanish may be applied to the coil end group. As a result, firm fixation between the radially outer-side terminals, between the radially inner-side terminals, and between the radially outer-side terminals and the radially inner-side terminals, and the coil end group is achieved. Therefore, the radially outer-side terminals are not brought closer to each other and the radially inner-side terminals are not brought closer to each other due to vibration. Thus, the insulating property is improved.
10, 10A stator, 11, 30 stator core, 12, 32 slot, 15 bead (connecting portion), 16 insulating sheet, 17 insulating member, 19, 39 conductor wire, 20, 40 stator winding, 21A, 21B winding body, 21f, 21h radially outer-side terminal, 21fa, 21ha distal end portion, 21fs, 21hs oblique-side portion, 21e, 21g radially inner-side terminal, 42A, 42B winding body, 42h, 42k radially outer-side terminal, 21ha, 21ka distal end portion, 21hs, 21ks oblique-side portion, 42i, 42m radially inner-side terminal, 50 thermistor (temperature detector)
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2017/014345 | 4/6/2017 | WO | 00 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2018/185902 | 10/11/2018 | WO | A |
| Number | Name | Date | Kind |
|---|---|---|---|
| 20120319522 | Ikeda | Dec 2012 | A1 |
| 20160043605 | Mizutani | Feb 2016 | A1 |
| 20160156238 | Tsuiki | Jun 2016 | A1 |
| 20200126694 | Kaneko | Apr 2020 | A1 |
| 20200127518 | Azusawa | Apr 2020 | A1 |
| Number | Date | Country |
|---|---|---|
| 2013-150548 | Aug 2013 | JP |
| Entry |
|---|
| International Search Report of PCT/JP2017/014345 dated Jul. 11, 2017. |
| Number | Date | Country | |
|---|---|---|---|
| 20200067364 A1 | Feb 2020 | US |
